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Fair Value of Financial Instruments - Fair Value Methodology (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value, excluding unsettled loan purchases $ 617,056 $ 505,723
Residential whole loans, at fair value, excluded from Level 3 Fair Value Methodology Disclosures 67,500 117,600
Discounted cash flow    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value, excluding unsettled loan purchases 176,829 113,166
Liquidation model    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential whole loans, at fair value, excluding unsettled loan purchases $ 440,227 $ 392,557
Residential Whole Loans | Level 3 | Discounted cash flow | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 5.00% 6.00%
Prepayment rate (percent) 0.30% 0.30%
Default rate (percent) 0.00% 0.00%
Loss severity (percent) 0.00% 10.00%
Residential Whole Loans | Level 3 | Discounted cash flow | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 7.60% 8.70%
Prepayment rate (percent) 12.10% 11.10%
Default rate (percent) 9.40% 9.10%
Loss severity (percent) 79.10% 79.40%
Residential Whole Loans | Level 3 | Discounted cash flow | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 6.60% 7.00%
Prepayment rate (percent) 7.20% 6.60%
Default rate (percent) 2.80% 3.10%
Loss severity (percent) 13.80% 17.00%
Residential Whole Loans | Level 3 | Liquidation model | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 6.80% 6.80%
Annual change in home prices (percent) (4.40%) (5.50%)
Liquidation timeline (in years) 1 month 6 days 8 months 12 days
Current value of underlying properties $ 14 $ 14
Residential Whole Loans | Level 3 | Liquidation model | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 42.00% 10.00%
Annual change in home prices (percent) 6.40% 6.10%
Liquidation timeline (in years) 4 years 4 months 24 days 4 years 4 months 24 days
Current value of underlying properties $ 4,900 $ 3,500
Residential Whole Loans | Level 3 | Liquidation model | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate (percent) 7.70% 6.90%
Annual change in home prices (percent) 1.00% 1.30%
Liquidation timeline (in years) 1 year 6 months 6 days 1 year 7 months 6 days
Current value of underlying properties $ 654 $ 626